IP SIP Phone v2
User’s Guide
Mar. 2005
[66/100]
CSeq: 1 INVITE
Contact: "7751" <sip:[email protected]:5060>
User-Agent: SIP-Phone/1.1
Content-Length: 171
Content-Type: application/sdp
v=0
o=m000dc300051 0 0 IN IP4 192.168.3.51
m=audio 5102 RTV/AVP 0 8 18
a=ptime:10
z
VoIP Bandwidth
Packet rate is especially important for sizing a network against a router because routers
are not only constrained by bandwidth but the number of packets per second (PPS) that they
can process.
This table calculates the bandwidth consumption based on uni-directional voice only. So
for the total bandwidth used for media during a simple two-way call, you should multiply the
value by two.
Link
CODEC
Frame per
RTP Packet
(Packet Rate)
IP
(kbps)
PPP
(kbps)
Ethernet
802.3
Averaged
Band-width
Utilization
Delay
(ms)
Mean
Opinion
Score
(MOS
6
)
1 (35 pps
7
)
16.8
18.4
21.6 28% 37.5
2 (17 pps)
11.2
12
13.6
43.2%
67.5
3 (12 pps)
9.3
9.9
10.9
52.8%
97.5
4 (9 pps)
8.4
8.8
9.6
59.3%
127.5
5 (7 pps)
7.8
8.2
8.8
64.1%
157.5
G.723.1
5.3 kbps
6 (6 pps)
7.5
7.7
8.3
67.7%
187.5
3.5-3.7
1 (35 pps)
17.9
19.5
22.7
31.9%
37.5
2 (17 pps)
12.3
13.1
14.7
47.9%
67.5
3 (12 pps)
10.5
11
12.1
57.1%
97.5
4 (9 pps)
9.5
9.9
10.7
63.8%
127.5
5 (7 pps)
9
9.3
9.9
68.1%
157.5
G.723.1
6.4 kbps
6 (6 pps)
8.6
8.9
9.4
71.4%
187.5
3.8-4.0
G.729ab
1 (100 pps)
42
46.8
56.4
16.5%
15
3.7-4.2
6
Mean Opinion Score
is very subjective and varies from one scoring episode to another depending on a variety of
things, e.g., sample size, acoustic environment, and methodology. The values presented here are for audio with no
packet loss. Some codecs fare better than others under packet-loss conditions.
7
PPS: Packet per Second.